Levenhuk Pl&ouml;ssl 7.5 mm Eyepiece, four-element, fully multi-coated, 1.25'' barrel diameter Optical design: 4-element Plossl, fully multi-coated Focal length, mm: 7.5 Barrel diameter, in: 1.25 Apparent field of view, : 50 Magnification: telescope focal length / eyepiece focal length